The 1511 Mobilux� series of illuminated hand-held magnifiers feature bright LED illumination. SMD LED (light emitting diode) illumination provides an alternative light source preferred by many patients due to its distinctly whiter spectrum and longer useful life. In addition to the bulbs offering nearly unlimited life (50,000 hours!), the batteries last 5 times as long as when used with incandescent bulbs. To soften the color of the light, small yellow filters are included with each magnifier. They can be snapped-on over the LED bulbs to provide 3 different illumination options. The Mobilux� LED hand-held magnifiers include a comfortable, ergonomic handle with a large, easy-to-operate ON/Off switch, a battery compartment that uses high quality springs that makes changing the batteries easier (2 AA batteries included) and a complimentary protective case. To all California residents - WARNING: This product contains a chemical known to the State of California to cause birth defects or other reproductive harm. Specs: Magnification: 5x Diopter: 20D Illumination: SMD LED Lens Type: Aspheric Lens Material: PXM Plastic Lens Coating: Cera-Tec Coating Power Source: 2 AA Batteries (Included) Mount: Ergonomic with easy on/off switch Lens Size: 2.28 in. Warranty: Limited lifetime warranty Accessories: Leatherette protective case included Miscellaneous: Snap-on yellow filter included